GLAZING AND PAINTING 117 



layer while hot. As soon as it is dry, ordin- 

 ary white lead paint may be applied with 

 little danger of its becoming discolored. 

 Shellac may also be used for the same pur- 

 pose. 



Hot water and steam pipes cannot well be 

 painted with lead and oil paints on account 

 of the action of the heat. One of the most 

 satisfactory treatments for heating pipes is 

 to paint them with the so-called "aluminum" 

 radiator paint. This is light in color but 

 rather expensive. Paints which dry with a 

 glazed surface are said to interfere with the 

 radiating properties of heating pipes. A 

 dull drying black paint sometimes recom- 

 mended for this purpose is a mixture of lamp- 

 black and turpentine, to which linseed oil is 

 added not to exceed a fourth of the bulk of 

 the mixture. 



Amount of Paint Required. This varies 

 according to the kind and condition of the 

 surface to be painted, and to some extent 

 with the kind of paint used. Painters usually 

 figure that a gallon of mixed paint will cover 

 250 to .300 square feet of white pine or cy- 

 press the first coat, and 350 to 400 square 

 feet the second coat. 



